Homeopathic remedy for emotionally volatile pre-pubescent girl?

I understand that homeopathy is an art that requires some background to prescribe an effective remedy, but until I can find a suitable practitioner I'm hoping someone can suggest a remedy for a 9 year old girl who has been suffering from at times severe mood swings. She is also experiencing strong body odor (despite regular showering and tea tree oil use on her armpits) and intermittent generalized stomach pains, nausea and loss of appetite. Other constitutional signs/symptoms are restlessness during the daytime, very mild non-inflammatory acne on her face. Any suggestions? We have an appointment scheduled with our GP for the GI issues. Many thanks in advance.